Joe Vennix discovered an authentication bypass vulnerability in dbus, an asynchronous inter-process communication system. The implementation of the DBUS_COOKIE_SHA1 authentication mechanism was susceptible to a symbolic link attack. A local attacker could take advantage of this flaw to bypass authentication and connect to a DBusServer with elevated privileges.
For Debian 7 Wheezy, these problems have been fixed in version 1.6.8-1+deb7u7.
We recommend that you upgrade your dbus packages.
Further information about Extended LTS security advisories can be found at: https://deb.freexian.com/extended-lts/